Abstract
This paper presents the comparison of results obtained from two codes with different degrees of accuracy and computational time on the case of a contra-rotating open rotor (AI-PX7). The main goal is to assess the capacity of a code based on singularity methods to predict global open rotor performance, the in-plane loads (also called 1P loads), and the blade load distribution during a full blade cycle. Moreover, installation and unsteady correction models have been implemented in this code in order to evaluate the possible improvements of initial predictions. Finally, a numerical method to quantify some of the mechanisms governing open rotor thrust and 1P loads is proposed.
Highlights
Due to the increase in fuel prices, airframe and engine manufacturers are looking for step-changing technologies that might enable them to produce more efficient and cleaner aircraft by 2020 and later
Among a number of emerging concepts, the contra-rotating open rotor engine (CROR) is likely to be an interesting option for the significant reduction of the aircraft fuel consumption and polluting emissions (Fig. 1)
Three different types of HOST simulations have been performed in order to assess the impact of nacelle effects and unsteady corrections on aerodynamic performance and 1P loads
Summary
Due to the increase in fuel prices, airframe and engine manufacturers are looking for step-changing technologies that might enable them to produce more efficient and cleaner aircraft by 2020 and later. In the results hereafter, induced velocities from the wake and the surrounding blades are calculated using MINT, a high-order free-wake module developed by Onera [2]. As it has been detailed in a previous communication [3], an unsteady airfoil model for curved and swept blades has been implemented in this lifting-line code. A method for quantifying the impact of a number of aerodynamic mechanisms on thrust and 1P loads has been developed, providing a useful methodology for blade designers
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